首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped
Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped
admin
2005-11-28
105
问题
Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped widespread investigation until recently for two reasons. First, the symbiotic association is so well-balanced that the roots of host plants show no damage even when densely infected. Second, the fungi cannot as yet be cultivated in the absence of a living mot. Despite these difficulties, there has been important new work that suggests that this symbiotic association can be harnessed to achieve more economical use of costly super phosphate fertilizer and to permit better exploitation of cheaper, less soluble rock phosphate, Mycorrhizal benefits are not limited to improved phosphate uptake in host plants. In legumes, mycorrhizal inoculation has increased nitrogen fixation beyond levels achieved by adding phosphate fertilizer alone. Certain symbiotic associations also increase the host plant’s resistance to harmful root fungi. Whether this resistance results from exclusion of harmful fungi through competition for sites, from metabolic change involving antibiotic production, or from increased vigor is undetermined.
The passage suggests which of the following about the increased resistance to harmful root fungi that some Plants infected with mycorrhizal fungi seem to exhibit?
选项
A、There are at least three hypotheses that might account for the increase.
B、The plants that show increased resistance also exhibit improved nitrogen fixation.
C、Such increases may be independent of mycorrhizal infection.
D、It is unlikely that a satisfactory explanation can be found to account for the increase.
答案
D
解析
综观全文,与菌根真菌共生的植物对其他有害真菌有抵抗作用,对其原因,文中提到三种意见,但究竟是哪一种目前还不能确定。因此D项为正确答案。
转载请注明原文地址:https://www.kaotiyun.com/show/5QIO777K
0
考博英语
相关试题推荐
Lookatthestatementsbelowandthetextabouttheimportanceoflisteningtopeopleontheoppositepage.Whichsectionof
Readthearticlebelowaboutthedifferencesbetweenchiefexecutivesandentrepreneurs.Choosethebestsentencefromtheo
WhichhoteldoesGraham’scolleaguerecommend?Howlongwilltheordertaketoarrive?
Lookatthenotesbelow.Someinformationismissing.Youwillhearawomanphoningthroughanordertoheadoffice.
Lookattheformbelow.Someinformationismissing.Youwillhearawomanbookingexhibitionspaceonthephone.Foreachquest
ReadthispartofaletterfromJohnBiggs,whoisthepresidentofabusinessclub.AsPresidentoftheCliftonBusinessClub,
BacktotheshopfloorotAttwood,ChiefExecutiveofAttwoodPublicity,hasattractedtheattentionofhisindustrybygoingto
Howtoevaluatetheperformanceofstudentsisstillaproblemthattroublesmanyprofessors.
Iaskedthetailortomakeasmall______tomytrousersbecausetheyweretoolong.
Culturalconflicts,suchasthosethattroubleAmericansocietytoday,maysometimesappeartobelessthanserioussquabblesbe
随机试题
注册会计师在控制测试中使用统计抽样,确定可接受的信赖过度风险为10%,可容忍偏差率为7%,选取了55个样本,并针对所选取的样本实施了既定的审计程序,发现了2个偏差,则()。
自发性气胸可在剧咳或屏气时出现
在静载试验中,每一小时的沉降不超过( ),并连续出现两次,即可视为稳定。
项目决策期管理工作的主要任务是()
检查固定资产入账价值时,注册会计师发现F公司分别对固定资产进行了如下会计处理,根据会计制度的规定,注册会计师不应认可的是()。
冲击疗法实施之前的具体准备工作包括()。
关于疫苗,下列说法错误的是()。
关于在网页中加入书签来实现跳转的说法,正确的是______。A.可以实现页面间的跳转B.可以实现同一页面中不同位置的跳转C.在页面编辑时,需要使用“Insert”中的“NamedAnchor”D.只能跳转到其它页面的页首
下列字符中,其ASCII码值最小的是
A、Becausethepersonwhohadinvitedhimdiedinanaircrash.B、BecausetheAmericanfilmproducerwasontheplanethatcrashe
最新回复
(
0
)